84.24 Chapter 14. The method of undetermined coefficients. Supplementary problems

84.24.1 problem 14.10
84.24.2 problem 14.11
84.24.3 problem 14.12
84.24.4 problem 14.13
84.24.5 problem 14.14
84.24.6 problem 14.15
84.24.7 problem 14.16
84.24.8 problem 14.17
84.24.9 problem 14.18